title: Improved selectivity of a high-performance liquid chromatography assay for debrisoquine and its 4-hydroxy metabolite from urine.
abstract: Debrisoquine is an antihypertensive drug that displays polymorphic metabolism and has been used to determine hydroxylator status in human subjects. A high-performance liquid chromatographic method for the simultaneous urine analysis of debrisoquine (D) and its primary metabolite, 4-hydroxydebrisoquine (4-OHD), is described. A cyanopropyl (CN) extraction column and CN analytical column were used with a mobile phase consisting of 20% acetonitrile/20 mM sodium dihydrogen orthophosphate (pH = 7.1) at a flow rate of 1.5 ml/min. The peaks of interest, as well as the internal standard, were eluted from the column in less than 14 min. The method described was validated for within-day and between-day accuracy and precision for both D and 4-OHD. Coefficients of variation at all concentrations tested were less than 4.1% for D and less than 9.3% for 4-OHD. The assay was used to evaluate D/4-OHD ratios, thereby determining hydroxylation status in 65 healthy male volunteers.
authors.affiliation: Department of Pharmacy Practice, College of Pharmacy, University of Minnesota, Minneapolis 55455.
authors.forename: K A
authors.initials: KA
authors.lastname: Johnson
authors.forename: V
authors.initials: V
authors.lastname: Kolatkar
authors.forename: R J
authors.initials: RJ
authors.lastname: Straka
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003647:Debrisoquin / Q000031:analogs & derivatives* / Q000652:urine*; D006801:Humans
chemical_list: C012359:4-hydroxydebrisoquin; D003647:Debrisoquin